from chiplotle.hpgl.commands import DR
from py.test import raises

def test_DR_01( ):
    t = DR( )

    assert t.run == t.rise == None
    assert t.format == 'DR;'


def test_DR_02( ):
    '''both run and rise (or none) must be set for formatting.'''

    t = DR(23)

    assert t.run == 23
    assert t.rise == None
    assert raises(Warning, 't.format')


def test_DR_03( ):
    '''run can be 0.'''

    t = DR(0, 25.3)

    assert t.run == 0
    assert t.rise == 25.3
    assert t.format == 'DR0.00,25.30;'


def test_DR_03( ):
    '''rise can be 0.'''

    t = DR(10, 0)

    assert t.run == 10
    assert t.rise == 0
    assert t.format == 'DR10.00,0.00;'

